Have you tried acetone to see if it comes off? could be a blob of silver glued on to make it appear as if a MM was there. Acetone won't hurt the coin, soak it and pick it with a wooden toothpick, If it's really on there, I'd go "S" MM.

"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA Life Member #3288 in good standing since 1982, EAC Member #6202, NBS Member, 2¢ variety collector.

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